2018778493 has 8 divisors (see below), whose sum is σ = 2028271320. Its totient is φ = 2009302080.

The previous prime is 2018778449. The next prime is 2018778499. The reversal of 2018778493 is 3948778102.

It can be written as a sum of positive squares in 4 ways, for example, as 2948089 + 2015830404 = 1717^2 + 44898^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2018778493 - 2²⁵ = 1985224061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018778499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290463 + ... + 297331.

It is an arithmetic number, because the mean of its divisors is an integer number (253533915).

Almost surely, 2^2018778493 is an apocalyptic number.

It is an amenable number.

2018778493 is a deficient number, since it is larger than the sum of its proper divisors (9492827).

2018778493 is a wasteful number, since it uses less digits than its factorization.

2018778493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8207.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 2018778493 is about 44930.8189664956. The cubic root of 2018778493 is about 1263.8520089665.

The spelling of 2018778493 in words is "two billion, eighteen million, seven hundred seventy-eight thousand, four hundred ninety-three".